Three novel organosilver(I) coordination networks constructed from diallylmelamine and polycarboxylates incorporating silver-vinyl bonding
作者:Yun-Hua Li、Di Sun、Hong-Jun Hao、Yang Zhao、Rong-Bin Huang、Lan-Sun Zheng
DOI:10.1039/c1dt11866h
日期:——
Diallylmelamine combines with Ag2O and auxiliary polycarboxylates to give three stable crystalline network structures, namely, [Ag2(dama)2(nipt)·H2O·C2H5OH]n (1), [Ag2(dama)(glu)]n (2), and [Ag4(dama)2(pma)·2H2O]n (3), (dama = diallylmelamine, H2nipt = 5-nitroisophthalic acid, H2glu = glutaric acid, H4pma = pyromellitic acid), which have been successfully synthesized and characterized by elemental analysis, FT-IR Spectra, powder X-ray diffraction and thermogravimetric analyses, and single-crystal X-ray diffraction. Complex 1 is a 1D double-chain extended by μ2-N,N′-(η2-vinyl)-dama and μ3-nipt along the b axis. Notably, dama ligands in 1 display two coordination modes (bidentate μ2-N,N′-(η2-vinyl) and monodentate μ1-N) and two different conformations (cisanti-gauche and transanti-anti). In 2, a pair of centrosymmetric glu ligands clamp two Ag(I) ions to form a half paddle-wheel [Ag2(COO)2] secondary building unit (SBU) which is further extended by μ2-N,N′-(η2-vinyl)-dama to form a 1D tape. Complex 3 is a 2D sheet built from μ3-N,N′,N′′-(η2-vinyl)-dama and μ8-pma. Interestingly, apparent silver–vinyl interactions with a η2 mode were commonly observed in the solid-state structures of 1–3 (Ag–C = 2.311(4)–2.467(5) Å). The structural dissimilarity between 1 and 2 is caused by the different auxiliary polycarboxylates and different coordination modes of dama. In addition, the thermal stabilities and emissive behaviors of them were also investigated.
二烯基三聚氟氮结合氧化银(Ag2O)和辅助聚羧酸盐,形成三种稳定的晶体网络结构,分别为[Ag2(dama)2(nipt)·H2O·C2H5OH]n (1)、[Ag2(dama)(glu)]n (2)及[Ag4(dama)2(pma)·2H2O]n (3)(dama = 二烯基三聚氟氮,H2nipt = 5-硝基异苯二甲酸,H2glu = 戊二酸,H4pma = 焦梅酸),这些结构已成功合成并通过元素分析、FT-IR光谱、粉末X射线衍射、热重分析及单晶X射线衍射进行了表征。复合物1是沿b轴由μ2-N,N′-(η2-乙烯基)-dama和μ3-nipt延展的1D双链结构。值得注意的是,1中的dama配体显示出两种配位模式(二齿μ2-N,N′-(η2-乙烯基)和单齿μ1-N)以及两种不同的构象(cis-反式和trans-反式)。在2中,一对中心对称的glu配体夹住两个Ag(I)离子,形成半匹轮[Ag2(COO)2]的二级建构单元(SBU),进一步通过μ2-N,N′-(η2-乙烯基)-dama扩展形成1D带状结构。复合物3是由μ3-N,N′,N′′-(η2-乙烯基)-dama和μ8-pma构建的2D片层结构。有趣的是,在1至3的固态结构中普遍观察到了明显的银-乙烯基相互作用,呈η2模式(Ag–C = 2.311(4)–2.467(5) Å)。1和2之间的结构差异是由于不同的辅助聚羧酸盐和dama的不同配位模式。此外,还研究了它们的热稳定性和发光行为。